NE5241 查看數據表（PDF） - Philips Electronics
零件编号
产品描述 (功能)
生产厂家
NE5241 Datasheet PDF : 6 Pages
| |||
Philips Semiconductors
Dolby ADM digital audio decoder
Product specification
NE5241
APPLICATIONS INFORMATION
The application diagram shows the complete Dolby ADM decoder
using the NE5241. The decoder is followed by a line driving
amplifier, which, depending on the application, may not be
necessary. For best frequency response accuracy, the following
parts should be tight tolerance: R13 to R21 should be 1%, and C13
to C20 should be 2.5%. The variable de-emphasis pole position
may be trimmed by adjusting the value of R17. The variable
impedance Pins 3 and 26 are very sensitive to noise pickup. Keep
the lead to C15 and C18 as short as possible. Excessive stray
capacitance on the multiplier output, Pins 1 and 28, will adversely
affect performance. Keep the leads to R13 and R19 short. It is
TIMING DIAGRAM
desirable to place a ground plane under the NE5241. This reduces
the inevitable cross-talk of the digital data (with several volts of
swing) into the audio (which has a noise level on the order of 40µV).
A ground plane is necessary to obtain the ultimate in noise
performance.
The timing diagram illustrates how the data is clocked into the
NE5241. The two audio channels share the three data input lines:
audio data, step-size data, and emphasis data. During the
low-to-high clock transition, the data is clocked into channel 1.
During the high-to-low clock transition, the data is clocked into
channel 2. The data must be stable during the clock transition.
CLOCK
AUDIO DATA
STEP-SIZE DATA
EMPHASIS DATA
tS tH
CH 1
CH 2
CH 1
CH 2
CH 1
Figure 2. Timing Diagram
SR01022
March 19, 1992
4
Share Link: 